Sand-molding apparatus



June 30, 1925.

S. F. KING SAND MOLDING APPARATUS 'Filed Aug. e, 1923 2 Sheets-Sheet l June 30, 1925.

-V S. F. KING SAND `MOLDING APPARATUS Filed Aug. 6, 1923 2 Sheets-Sheet 2 Patented June 30, 1925.

PATENT oFFlcE.

l SAMUEL F. KING, 0F BIRMINGHAM,

SAND-MOLDING- APPARATUS.

Application filed August 6,r 1923. SerialeNo 656,060.

ToaZZ whom t may cof/acera.'

f'Beit known that I, SAMUEL F. KiNo, a citizenV of the'United States of America, residingat Birmingham, in the county of Jefferson and State of Alabama., have invented certain new and useful Improvements in Sand-Molding Apparatus, of which the following is a specification.

My invention relates to improvements in molding apparatus especially adapted for the casting of hollow articles such aspipes, radiators and the like, and it-contemplates the provision of means which. will dispense with hand ramming and which will make use of mechanism to squeeze or pack the sand about the patterns and core prints in the manner calculated to produce the requisite density or firmness of the sand without interfering with the pro-per venting of the mold. y

Moreparticularly my invention contemplates the utilization of a sand squeezing machine adapted to receive the invertedcope or drag and having independently movable stripping-plates and patterns, my improved operation contemplating squeezing the sand in the flask first by movement of the stripping plate relatively to the patterns, and then completing the squeezing operation by moving the stripping plate and patterns together, and finally by lowering the patterns relatively to the stripping plate to stripthem from the sand mold.

It will be noted that the joint vmovement of the stripping plate and'patterns which continues the conclusion' of the `squeezing operation avoids the breaking of the sand mold which would occur if relative movement were permitted between the stripping its final position.

'y VAn important feature of my vinvention is plateansdi patterns after eitherhadreached lthe mounting` of the core prints for vthe pat-V terns'when used on the stripping plate vso independently of the stripping plate. j

My,A invention also contemplates the provision of means readily adapted to adjust the operating position of the patterns and the lowered position of they .stripping plate relatively to the patterns, said adjustments making it possible to accurately match the plate and patterns for different adjustments which determine the amount of loose sand used and the degree of its compression.

My invention also contemplates the novel `idea of adapting the tumbling bars controlling the receding movement of the patterns to he engaged by the rising stripping plate at anyV predetermined point so as to plick up and move the patterns with the p ate.

VMy invention also contemplates an improvement in the forming of the pouring ygates by the use of downwardly tapering gate pins which extend to the parting line, it being possible to use such taper ypins by reason of the fact that the sandis squeezed towards the larger end of the pin, thus making itpossible to draw it and avoiding the necessity of enlarging the present gate holes formed by straight gate pins.

` My invention further comprises the novel details of construction and arrangements of parts, which in their preferred embodiment only are illustrated in the accompanying drawings, whichY form a part of this speciication, andV in which I Fig. l is a side elevation; and

Fig. 2 is a plan view of my'sand molding machine.

Fig. 3 is an end view; and

Fig. 4: is a cross-sectional view taken on lthe line 4--4 of Fig. l.

Figs. 5, 6, 7 and 8 are cross-sectional views corresponding to Fig. 4, showing the cope or drag assembled on the molding machine and illustrating the various operations inciden- `tal to forming theI mold.

Fig. 9 shows the complete mold; and Figs. l0 and 11 show the completedrag and cope, respectively.

Similar reference numerals refer to similar parts throughout'the drawings. Athat it is only the patterns properthat move I have illustrated my invention as applied to the manufacture of soil pipe, though the pattern design may obviously be changed for the molding of any cast article. In the 'drawings I have shown the apparatus adapted to form `molds for a short length soil pipe which will serve vfor illustrative purposes. My l'molding apparatus comprises a rectangular frame l open top and bottom and having vertically movable therein an inverted boX-lilre plunger or squeezer member- ,2L openV underneath and having alongitudinal vertical central partition 3 and a top plate 4 .which forms theV stripping plate of the apparatus.v llheplune ger Works With a c'lose sliding rit' nrtlie frame and has formed in its top plate 4 openings 5 through which a pair "of" pipe patterns 6 project. 'l}hese patterns are` shown with straight deep parallel sides which` arei sliding-ly engaged;- `by the inafrgi.- nal side-walls of .the openingsl 5 which conformi-thereto.` The plate 4c also carries` at each end core .prints-:7 and 8f which are tast thereon and@ are not attached to the pipe patterns 6 asf;iscustomary.-V Y Y. l A

`Y r.llhe' patternsA 6 are supported by tivo or more. Vtumbling bars Q'having pattern ,j supporting camvrnembers. l04 thereon and these tumbling bars `are mounted in vertically elongate'dfslotslll, in]` the side vvalls and central partition 3 of the plunger. The ends oftlietumbling bars project through vert-r cal elongated sl'otsm12f in the sides of the 'traine l and are adapted at each end to `be engaged by a pairE off .independently adjust- Y able stopcplatesf'l?) and: letadjustably conlncctedy by setscrews l5 tothe side of Ythe frame.. These stopf platesl maybe adjusted toI liniitthe verticail movements of the tumbling bars. cranky handle 172 is fast on one tuinblinlgbar and is connected, byra link 18` to a crank 1'9' .fast 'on the otherrturnbling bar so as topinove the tivo in unison. e The l plungerl2- has'atthe centero'f each end an 40 elongated blocl'rQO which. slidesgin -a slot 2l 'in the traine; 1A. boss 22 atthe upper end of each slide block projects beyond the yend Wall of the 'framelandcarries a stud or 1 .pin 23 toi Which isl connected the `upper end or' an operating rod 24 having therei-naturn buckle 25 for purposes Vor adjusting its length. :This operating rodat its lower'end is connected to a cranlrr26i`ast on a cross har or shaft 27 extending lengthwise through and journaledi inthe lower rearl portion oi the trainer. @Tlieiplunger2 isslotted or cut away at 28tol pass the saine.y The cranks26 have sockets 29A which receive operating handles 30. `The slots 21 extendahnost tothe `Vtop of theitraine, thus-permitting the slide blocks 2G and studs 22'toride upwardly `when thelevers 30` are "depressed-l s'o, as to lift the plunger 2 and withit `thestripping patterns 6in the niannerrvhich In operating my invention I first place a :drag 3l' mounted..\vith its largerpart dovvn- 'Ward on the irame andy suitably clamp lit thereto byclarnping andfinatching means notI shown, The tumbling bars are setto f aosition shown in Fio. 5 and is read Jfor the squeezing operation Which is accomplished entirely by the operation of the levers 30 or equivalentpower ineans to move the plunger V2, Vand Rvhich. produces the following sequence of events.. j

Y First, through the rods 24 and studs 22 the piunger carrying the stripping piateand vcore prints alone are raised, thus effectin the initial, or partial squeezing or thesan round the margins of the patterns and the core prints butnot over the patterns proper.

At Vthe completion or' this initial squeezing operation, the parts standk asshovvn 1n Fig.

6, which shows that the plunger.` has been 'raised until` the lower ends oftheslots lil therein engage and pickupy the tumbling bars 9, whereupon tlie further raising of the stripping .plate will. carry with it the turnbling bars and the patterns to the position shown in Fig. E when the drag is flinished.

The nextfoperation, as fslioWn inF ig. 8,`iS`

to move the crank handle-17 and, cause the patterns togrecede from the sand` mold, after Awhich the finished dragl can, be lifted ofand the cope V33,mounted andsqueezedt When theV cope is rammed taper gate pins 34 are` provided with `their larger lendsr uppermost and mounted by inserting their lower ends inthe hcles ifn the strippingplateso that by: lifting ,off the plate 32,11 completely insand, as shown in'Fig. ll, and adapted` to register with the gate .37 formed inthe usual .manner` in thedrag mold.` It Will thus `be seen that the Aentire operation` is carried outmechanically and `Without requiring expertllabor or any handvforlrexcept the `manipulation or' the levers 3Q and thedrawing of the gate and gate pins. 34. i f l l j' By adjusting the plates 141 and 115 theupper Vand `lower Vlimits of movement of the tumbling bars can be controlled and conse Vquentlythe raised and lowered positions of -thepatternsi- It being understood* that theA Vdownward, movement of theaplunger 2 is 38 on the i'ranie, it follows that by manipullating the turn. buckles 125 the plunger and stripping ,plate 4 can be adjusted relatively toA the patterns so that thelatter `will accuratelymatch the-patterns Whatever their adjustments. Obviously, by raising or low- Veringthepatterns the aniountof sand above them is varied and its density in v.the finished jinold controlled. It lis important to note that in .niyoperationthesand about the u edges of the prints and the patterns, Vbut not roo ishedtaper gate hole 361s formed in the n .limited'by the cranks 26- strilingthe stops proper.

over the patterns, is squeezed to a considerable degree before any pressure at all is applied to the'sand immediately above the patterns proper. This results in very sharp lirm` surfaces where the molds meet and forms hardprints and light compression of the sand above and belowthe-complete mold This is ideal in that it reduces llns and run outs to the maximum extent possible and leaves a sand mold which will vent freely. V Y

I claim as a distinctive feature of my invention the ysqueezing ofthe sand toward the smaller part of the flask element (cope or drag), preferably using a movable stripping plate-to do the work. The advantages are obvious, I can use a shallower flask element free of sand strips and therefore less sand; I can press the sand tightly against the flask walls as they converge so that it will not break out; I can use bars in the flask to more firmly hold the sand; and by compressing the marginal edges of the sand against converging and not diverging flask walls I get the desired compactness about the mold cavity which it has been very hard to get where the sand is rammed towards the larger part of the flask.

Though I have described with great particularity the details of the embodiment of the invention herein shown, it is not to be construed that I am limited thereto, as changes in arrangement and substitution of equivalents may be made by those skilled in the art without departing from the invention as defined in the appended claims.

What Iclaim as new and desire to secure by Letters Patent, is

l. A sand mold apparatus, comprising a frame, a flask element mounted thereon, a stripping plate and pattern mounted in the frame free to move towards said flask element, core prints for the pattern mounted on the stripping plate, and means to squeeze sand into said flask element first by; the movement of the stripping plate only, a-nd lastly by joint movement of stripping plate and patterns.

2. A sand mold apparatus, comprising a frame, a ilaskelement mounted thereon, a stripping plate and pattern mounted in the frame free to move independently towards said flask element, and means to squeeze sand into said flask element first by a movement of the stripping` plate only. and then by a joint and equal movement of stripping plate and patterns.

3. A molding apparatus in accordance with claim 2, in which the means to squeeze tbe sand in the flask is adapted to pick up and move both stripping plateV and patterns jointly and equally throughout the conclusion of the squeezing operation.

4. In a molding apparatus, in combination, a frame adapted to receive a flask element, a stripping plate adapted to recede into -said frame and means to raise it, patterns adapted to recede into said frame and means to raise and vlower them, and means operable at a predetermined point in the liftmg movement of thestripping plate to cause the stripping plate and pattern to lllOVe In IIHISOII.

5. A molding apparatus in accordance with claim el, in which the means for raising and lowering the patternsare tumbling bars which have a lost-motion connection with said stripping plate.

6. In a molding apparatus, a frame adapted to receive a flask element, a stripping plate adapted to recede into the frame, means to raise said stripping plate to squeeze sand into the llask element, patternsrelative to which said stripping plate is movable, tumbling bars for the patterns, and means to establish a lost-motion operating connection between the stripping plate and tumbling bars.

7. A molding apparatus is accordance with claim 6, in which the frame is provided with vertically elongated slots through which the tumbling bars pass.

8. A molding apparatus in accordance with claim 6, in which the stripping plate has depending side members, there being aligning vertically elongated slots in said members and frame through which said tumbling bars project.

9. A molding apparatus in accordance with claim 6, in which the frame has vertically elongated slots through which the tumbling bars pass, and adjustable stop means to limit the movement ofsaid tumbling bars.

10. In a sand molding apparatus, a frame adapted to receive a flask element, a stripping plate vertically movable in the frame, operating means to raise said plate and squeeze sand in the flask element, patterns having straight sides, tumbling bars supporting said patterns in the frame, there being slots in the frame to permit the tumbling bars to rise with the patterns, means movable with the stripping plate to pick up the tumbling bars and carry the patterns with them, and means to adjust the operating means to cause the stripping plate to match the patterns in operating position.

l1. In a sand molding apparatus, a frame adapted to receive a flask element, a stripping plate vertically movable in the frame, operating means to raise said plate and squeeze sand in the flask element, patterns having straight sides, tumbling bars supporting said patterns in the frame, there being slots in the frame to permit the tumbling bars to rise with the patterns, means movable with the stripping plate to pick up and carry the patterns withA them, means to adjust the operating means to cause the stripping plate 4:1." umich the @olii-ems in operating position, and means to akoyjist tlle-ogera'mg posltlon of the patternsf 12.111 a molding-apparatus, a stripping Y,

plate plunger movable to squeeze Sanc'l in a flask,` a. pattern movable to (so-operate withl the plun'gen core prints, and means to move said prints independently ot' the pattern to squeezey the Sand about them moreV tightly fitness SAMUEL KING. 

